5.2 Stock Rotation, FEFO & Expiration Management

Stock rotation is the practice of organizing inventory so that product leaves the shelf in the order that minimizes waste and avoids dispensing expired drugs. In a warehouse, FIFO (First-In-First-Out) — rotating by the date the product was received — is a common default. Pharmacies do not use FIFO as the primary rotation method. Pharmaceuticals are rotated by FEFO (First-Expired-First-Out), which keys the rotation to the expiration date printed by the manufacturer (or the beyond-use date assigned to a compounded preparation), not to the receipt date.

Why FEFO, Not FIFO

FIFO assumes the oldest receipt is the first to leave. That assumption fails in a pharmacy because two lots of the same drug received on different dates can have expiration dates that are out of order — the later-received lot can expire earlier than the earlier-received lot (different manufacturer lots, a short-dated lot a wholesaler shipped to clear its own inventory, a different vendor entirely).

If a pharmacy rotates strictly by receipt date (FIFO), it can end up dispensing the longer-dated lot while the shorter-dated lot sits on the shelf and expires. FEFO avoids this by always pulling the lot with the earliest expiration date first.

Worked Example

FIFO would dispense Lot A first (received earlier). But Lot B expires first. Under FEFO, Lot B is pulled first — which is the correct pharmacy practice. A short-dated lot received later must move before a longer-dated lot received earlier.

---

Expiration Date vs. Beyond-Use Date (BUD)

These two terms are not interchangeable, and the exam tests the distinction.

• Expiration date — Assigned by the manufacturer. It applies to the unopened product in its original container, stored under labeled conditions. Once the container is opened, repackaged, or compounded into something else, the manufacturer's expiration date no longer governs the in-use preparation.
• Beyond-Use Date (BUD) — Assigned by the pharmacy to a compounded preparation per USP <795> (nonsterile) or <797> (sterile) stability criteria. The BUD is typically much shorter than a manufacturer expiration date and reflects the preparation's stability once it has been made.

Example

A bottle of metronidazole tablets from the manufacturer carries an expiration date of January 2028. A pharmacy compounds a metronidazole oral suspension from those tablets. The compounded suspension is assigned a BUD of 14 days under USP <795> (a typical nonsterile aqueous oral liquid). The January 2028 expiration on the bulk bottle does not transfer to the suspension; the suspension expires in 14 days.

---

Shelf-Life Checks

Pharmacies perform routine shelf-life checks to catch product before it expires on the active shelf. A typical program includes:

• A rotating cycle check of a subset of the formulary each month, with each product's expiration date recorded against its shelf location.
• Segregation of product within 90 days of expiration (or whatever internal threshold the pharmacy sets) into a 'short-dated' area or flagged in the PIS, so it is dispensed first under FEFO or returned for credit before it expires.
• Removal of any item whose expiration date has passed from active stock immediately.

---

Quarantine of Expired Stock

Once a product is expired, it must be quarantined — physically segregated from active dispensing stock, clearly labeled 'Expired — Do Not Dispense', and made unavailable for normal picking. A few key rules:

• Expired product is never dispensed to a patient, even if it 'looks fine.' The drug may have lost potency, undergone chemical degradation, or changed in ways not visible to the eye.
• Expired product is not returned to the wholesaler as saleable goods; it is handled as a return for destruction / reverse distribution.
• Controlled substances that are expired follow additional DEA requirements for destruction and wastage documentation (DEA Form 41 for a registrant's own expired stock, or a reverse distributor authorized to handle controlled substances).

---

Returns via a Reverse Distributor

A reverse distributor is a firm that handles the return, credit, and destruction of expired, recalled, or otherwise unsaleable pharmaceuticals. The workflow typically runs:

1. Pharmacy quarantines expired product, segregated and labeled.
2. Pharmacy ships the expired product to the reverse distributor with a manifest (NDC, lot, quantity, expiration).
3. The reverse distributor verifies whether the manufacturer offers return credit (many do for unopened product returned before a defined date after expiration — often 6–12 months, depending on the manufacturer's return policy).
4. Where eligible, the reverse distributor issues credit; where not, the product is destroyed under the reverse distributor's destruction authorization.
5. The pharmacy retains the return manifest and the destruction certificate as part of its recordkeeping — DSCSA and state board rules both require this documentation to be retained.

---

Why Dispensing an Expired Drug Is a Regulatory Violation

Under FDA law and every state pharmacy practice act, dispensing an expired drug is a violation. The manufacturer's expiration date is the date through which the product is expected to meet labeled potency and stability specifications when stored as labeled. Past that date, the manufacturer's guarantee no longer holds. State boards treat dispensing of expired product as dispensing an adulterated or misbranded drug, and it can result in license discipline for the pharmacy and the pharmacist-in-charge, and patient harm if the drug is no longer at labeled potency (a real risk for, e.g., expired nitroglycerin, insulin, epinephrine, or oral contraceptives).